Rosser et al. (2007) found that surgeons who had played video games during college made fewer errors on a test of laparoscopic skills than those who hadn't played video games. Imagine that for a random sample of 25 surgeons, researchers assessed the number of hours per week (HPW) each surgeon reported playing video games in college and the number of errors (Errs) each one made on the test of laparoscopic skills. Let's say that the results showed that the mean number of errors was 7.5 with a standard deviation of 2.5, and the mean number of hours spent playing video games was 12 with a standard deviation of 4.5. The correlation between Errs and HPW was r= -.25. Compute the estimated standard error of the regression slope for the regression equation that predicts Errs from HPW.

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